JP2010078105A - Method for milling dovetail for fixing anchor plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for milling a dovetail for fixing, to a disc brake caliper, an anchor plate formed in a pad forming arm for fitting a brake pad with an anchor plate, which is used for the disc brake of a railroad vehicle. <P>SOLUTION: In this method for milling a dovetail for fixing an anchor plate in the pad support arm for fitting the anchor plate of the pad assembly to the caliper, a recess for a dovetail, into which the anchor plate is to be inserted, is previously formed in a casting process for forming the pad support arm, and thereafter, the corners of the recess are formed with a dovetail, into which the dovetail tenon of the anchor plate is to be inserted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dovetail groove processing method for fixing an anchor plate formed on a pad support arm for attaching a brake pad with an anchor plate used for a disc brake of a railway vehicle or the like to a disc brake caliper.

  A conventionally known disc brake caliper is attached so as to straddle the brake disc, and the caliper incorporates a piston and a cylinder for pressing the brake pad against the brake disc. The structure will be briefly described with reference to FIG. 6. This railway disc brake device (railway car caliper brake) includes two brakes each having a pad assembly 51 to which a brake pad for clamping the disc is attached. An arm 52 is provided. One end of the brake arm 52 is pushed out by an actuator (not shown) to swing the brake arm 52 around a support pin 53, and is shown by a pad assembly 51 to which a brake pad is attached. The brake is operated by pinching the disc.

  The pad assembly 51 used in the conventional apparatus can be attached to the caliper side by inserting the dovetail part 54 formed on the anchor plate into the dovetail groove 56 formed on the pad support arm 55 of the caliper. It has become.

  In the conventional pad assembly, as shown in FIG. 7, the brake pad 23 has a lining 23a (friction material) that contacts the brake disc riveted to the lining mounting plate 23b by a plurality of rivets 23c. Further, an anchor plate 24 for fixing the brake pad 23 to the caliper is riveted to the lining mounting plate 23b by a plurality of rivets 24a. The anchor plate 24 has an ant tenon portion 24b and the like, and a pad support arm on the caliper side for mounting the anchor plate 24 has an engagement portion such as a dovetail groove (not shown) that can slidably receive the ant tenon portion 24b. Is formed. Then, the anchor plate is slidably engaged with the pad support arm of the caliper by the joint between the ant tenon portion 24b and the dovetail portion of the pad support arm, and then both ends of the anchor plate are fixed with lock members. (Patent Document 1), the pad assembly is fixed to the caliper side.

JP 2003-247575 A

  The configuration of the pad assembly will be described in more detail. FIGS. 8A and 8B are a side view and a plan view of the anchor plate constituting the existing pad assembly, and FIGS. 9A and 9B show the existing pad in a state where the anchor plate is attached to the brake pad. It is the side view and top view of an assembly. The existing anchor plate shown in FIGS. 8A and 8B is manufactured by cutting, and a brake pad is provided on this anchor plate as shown in FIGS. 9A and 9B. It is fixed by fixing means. The dovetail part of the anchor plate of the pad assembly can be fitted into a dovetail groove formed in the pad support arm on the caliper side.

  Since all the dovetail portions formed on the caliper side are currently processed by cutting, special blades for that purpose are required, and there are many disadvantages such as a long processing time. Moreover, since the anchor plate inserted into the dovetail groove is also manufactured by cutting, it is expensive.

  Therefore, the present invention is a casting process for forming a caliper, in which a dovetail groove shape is formed in advance on the caliper side, and then the dovetail groove is machined using an existing processing technique such as a milling cutter. Further, the casting tolerance of the dovetail can be avoided while maintaining the strength as the anchor plate by forming the anchor plate into a sheet metal.

Therefore, the present invention provides means for solving the problems adopted by the present invention.
In the grooved processing method of the pad support arm for attaching the anchor plate of the pad assembly to the caliper, a recess for the groove for inserting the anchor plate is formed in advance in a casting process for forming the pad support arm, and then A dovetail grooving method for fixing an anchor plate, characterized in that a dovetail groove for inserting an ant tenon portion of an anchor plate is formed at a corner of the recess by a milling cutter.
Further, the present invention provides a dovetail groove processing method for fixing an anchor plate, wherein a protrusion for caliper reinforcement is formed in the recess for dovetail groove in a casting process.
Further, the present invention is a dovetail groove fixing method for anchor plate fixing, wherein an anchor plate of a pad assembly used for the dovetail groove forming method is formed of sheet metal.

According to the present invention,
Whereas the current dovetail is created by cutting from an empty plane, the present invention creates a shape to some extent by casting the part that will be originally cut, and then uses a milling cutter or the like to form the final dovetail. A process for machining grooves is adopted. As a reason to escape with the casting as described above, the existing pad assembly pushes the pad assembly on the anchor plate surface, whereas the present invention has a structure in which the pad assembly is pushed on the pad surface. This eliminates the need for machining and shortens the machining work.
Moreover, in the present invention, since the processing is performed using an existing tool such as a milling cutter, the processing is easy, and a dovetail groove of any angle can be processed by changing the angle at the time of processing of the milling cutter. It is.
The current dovetail is created by cutting the shape from an empty plane, which makes the work expensive and wastes material. On the other hand, the present invention makes it possible to avoid casting tolerances while maintaining the strength of the anchor plate by making the anchor plate into a sheet metal, and supports any angle of the anchor plate by changing the bending angle. It is possible to achieve a unique and excellent operational effect.

  The present invention employs a process in which a part to be originally cut on the pad support arm side is made to some extent by casting, and then a final dovetail is processed by a milling cutter or the like. In this way, the machining operation can be shortened by escaping the portion to be cut with the casting in advance.

  Hereinafter, a dovetail groove processing method according to the present invention will be described with reference to FIG. 1. FIG. 1 (a) is a side view of a cast-shaped pad support arm, and FIG. The side view of an arm, (c) is a figure explaining the condition which cuts a dovetail groove in a pad support arm.

A description will be given of a method for forming a dovetail for attaching a pad assembly to a caliper in a conventional disc brake.
In FIG. 1, 1 is a pad support arm, and this support arm is made of a casting. When forming this casting, a recess 2 for attaching an anchor plate as shown in FIG. 1 (a) is formed in advance on the pad support arm 1 side. A dovetail groove 3 is formed on the side of the pad support arm constructed in this way by a milling cutter 4 having an appropriate angle at the corner of the recess, as shown in FIG. A pad support arm having a dovetail groove 3 cut by a milling cutter is shown in FIG.

  The configuration of the pad assembly fitted in the dovetail will be described. FIG. 2 (a) is a plan view and side view of a sheet metal anchor plate constituting the pad assembly according to the present invention, and FIG. 2 (b) is a view of the sheet metal pad assembly. FIG. 2C is a perspective view of a sheet metal anchor plate.

  The anchor plate 5 shown in FIG. 2 is configured by integrally forming the dovetail portion 6 by sheet metal processing, and an anchor plate positioning hole 9 is appropriately configured. As in the conventional pad assembly, the brake pad 7 is fixed to the anchor plate 5 by a known fixing means such as a rivet as shown in FIG.

  As shown in FIG. 3, the pad support arm 1 and the pad assembly constructed as described above are fitted and fixed to the dovetail groove 3 formed on the pad support arm side of the dovetail portion 6 of the anchor plate 5 made of sheet metal. The By making the anchor plate into a sheet metal as in this example, it is possible to avoid casting tolerances while maintaining the strength of the anchor plate, and it is possible to cope with anchor plates of any angle by changing the bending angle. it can. Further, since the anchor plate made of sheet metal has a structure in which the pad assembly is pushed on the pad surface, it is not necessary to process the surface with which the anchor plate comes into contact, and the processing work can be shortened.

In addition, the ant tenon part 8 produced by the conventionally well-known method as an anchor plate can also be fittingly fixed to the dovetail groove | channel 3 processed by the process of this invention, as shown in FIG.
Further, by forming the protrusion 10 as shown in FIG. 5 on the anchor plate mounting portion of the pad support arm 1, the strength of the pad support arm can be improved.

As described above, the dovetail groove according to the present invention is formed to some extent by casting the part on the pad support arm side that is originally cut, and then the final dovetail groove is processed by a milling cutter or the like. Yes. As described above, according to the present invention, it is not necessary to process the surface with which the anchor plate comes into contact, and the processing work can be shortened.
Further, even in the conventionally known pad assembly described with reference to FIGS. 6 and 7, the dovetail portion can be fitted into the dovetail groove of the pad support arm formed by the method of the present invention.

  As mentioned above, although the Example of this invention was described, it can implement with a various form within the scope of the meaning of this invention. For example, a dovetail groove can be formed from a casting material using a core or the like without using a milling cutter or the like. In addition, the specifications described in the above-described embodiments are merely examples in all respects and should not be interpreted in a limited manner.

  The present invention can be used for a railway brake caliper.

(B) is a side view of the pad support arm in a state where the dovetail is cut, and (C) is a state where the dovetail is cut in the pad support arm. It is a figure to do. (A) is a plan view and a side view of a sheet metal anchor plate constituting the pad assembly according to the present invention, (b) is a plan view and a side view of the sheet metal pad assembly, and (c) is a perspective view of the sheet metal anchor plate. It is sectional drawing of the state in which the pad support arm and the pad assembly were fitted and fixed by the dovetail groove. It is sectional drawing of the state in which the pad support arm and the conventionally well-known pad assembly were fitted and fixed by the dovetail groove. It is a figure explaining the reinforcement state of a pad support arm. It is a front view of a conventionally well-known railway disc brake device (a caliper brake for a railway vehicle). It is sectional drawing of a conventionally well-known pad assembly. It is the top view and side view of an existing anchor plate. It is the top view and side view of an existing pad assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pad support arm 2 Concave part 3 Dovetail groove 4 Milling cutter 5 Anchor plate 6 Dovetail part 7 Brake pad 8 Conventional dovetail part 9 Positioning hole 10 Protrusion

Claims (3)

In the grooved processing method of the pad support arm for attaching the anchor plate of the pad assembly to the caliper, a recess for the groove for inserting the anchor plate is previously formed in the casting process for forming the pad support arm, and then A dovetail processing method for fixing an anchor plate, wherein a dovetail groove for inserting an ant tenon portion of an anchor plate is formed at a corner of the recess. The method for machining a dovetail groove for fixing an anchor plate according to claim 1, wherein a projection for reinforcing the caliper is formed in the dovetail portion for dovetail groove in a casting process. 3. The dovetail groove fixing method for anchor plate fixing according to claim 1 or 2, wherein an anchor plate of a pad assembly used for the dovetail groove forming method is formed of sheet metal.

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